The Doorking 1215-061 is a 20 VA transformer with a 12VAC output. The transformer is often used with access control devices and controllers. A variety of accessory transformers are available to power the different products that DoorKing sells. AC transformers are typically used with access control devices and controllers, while DC transformers are used with magnetic locks and proximity card readers. Check the individual product to determine which transformer is required. Please Note that many DoorKing products already include a transformer or require a transformer if not powered by a DoorKing operator.